Introduction of JCOE LSAW Steel Pipe Manufacturing Process

Introduction of JCOE LSAW Steel Pipe Manufacturing Process

The JCOE LSAW steel pipe manufacturing process is a new type of welded steel pipe forming technology that emerged in the 1990s. The main forming process of this technology is to first mill (or plane) the pre welded joint of the steel plate, then pre bend it in the width direction of the steel plate, and then gradually form it in the order of J  type → C   type → O type. During the forming process, after multiple pressures stamping, each stamping is formed using a three-point bending mold as the basic principle.

Due to the fact that the raw material steel plate for LSAW steel pipes is formed through multiple progressive molds, the following basic problems must be solved:

1. How to determine the shape of the mold, the upper mold stroke of the forming machine, and the distance between the lower molds;

 2. How many stamping times are required to ensure the appropriate bending radius and open O-shaped steel pipes are stamped. And these issues are different from the steel plate material, which is related to the specific mechanical properties of the steel plate material in the steel plate production plant, as well as the steel pipe model (diameter and wall thickness). Whenever production changes to new specifications or new steel plate materials, a certain number of samples are taken for pressure testing to find suitable production and processing data.

The trial and error method is relatively reliable because it is based on scientific data of JCOE molding equipment imported from Germany. Due to the large number of JCOE process parameters for straight seam steel pipes, production process data was not only determined through trial and error methods, but also several months of debugging process were required to obtain a mature process.